Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms
International audience t fledging, king penguin juveniles undergo a major energetic challenge to overcome the intense and prolonged energy demands for thermoregulation and locomotion imposed by life in cold seas. Among other responses, sea acclimatization triggers fuel selection in skeletal muscle m...
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ftunivlyon:oai:HAL:hal-02998636v1 2024-02-11T10:05:32+01:00 Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms Roussel, Damien Le Coadic, Marion Rouanet, Jean-Louis Duchamp, Claude Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) 2020-11-04 https://univ-lyon1.hal.science/hal-02998636 https://doi.org/10.1242/jeb.233668 en eng HAL CCSD The Company of Biologists info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.233668 hal-02998636 https://univ-lyon1.hal.science/hal-02998636 doi:10.1242/jeb.233668 ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://univ-lyon1.hal.science/hal-02998636 Journal of Experimental Biology, 2020, 223 (21), pp.jeb233668. ⟨10.1242/jeb.233668⟩ Endothermy Marine birds Metabolic rate Non-shivering thermogenesis Shivering [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2020 ftunivlyon https://doi.org/10.1242/jeb.233668 2024-01-24T17:47:19Z International audience t fledging, king penguin juveniles undergo a major energetic challenge to overcome the intense and prolonged energy demands for thermoregulation and locomotion imposed by life in cold seas. Among other responses, sea acclimatization triggers fuel selection in skeletal muscle metabolism towards lipid oxidation in vitro, which is reflected by a drastic increase in lipid-induced thermogenesis in vivo. However, the exact nature of skeletal muscle thermogenic mechanisms (shivering and/or non-shivering thermogenesis) remains undefined. The aim of the present study was to determine in vivo whether the capacity for non-shivering thermogenesis was enhanced by sea acclimatization. We measured body temperature, metabolic rate, heart rate and shivering activity in fully immersed king penguins (Aptenodytes patagonicus) exposed to water temperatures ranging from 12 to 29°C. Results from terrestrial pre-fledging juveniles were compared with those from sea-acclimatized immature penguins (hereafter ‘immatures’). The capacity for thermogenesis in water was as effective in juveniles as in immatures, while the capacity for non- shivering thermogenesis was not reinforced by sea acclimatization. This result suggests that king penguins mainly rely on skeletal muscle contraction (shivering or locomotor activity) to maintain endothermy at sea. Sea-acclimatized immature penguins also exhibited higher shivering efficiency and oxygen pulse (amount of oxygen consumed or energy expended per heartbeat) than pre-fledging juvenile birds. Such increase in shivering and cardiovascular efficiency may favor a more efficient activity–thermoregulatory heat substitution providing penguins with the aptitude to survive the tremendous energetic challenge imposed by marine life in cold circumpolar oceans. Article in Journal/Newspaper King Penguins Université de Lyon: HAL Journal of Experimental Biology |
institution |
Open Polar |
collection |
Université de Lyon: HAL |
op_collection_id |
ftunivlyon |
language |
English |
topic |
Endothermy Marine birds Metabolic rate Non-shivering thermogenesis Shivering [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
Endothermy Marine birds Metabolic rate Non-shivering thermogenesis Shivering [SDE.BE]Environmental Sciences/Biodiversity and Ecology Roussel, Damien Le Coadic, Marion Rouanet, Jean-Louis Duchamp, Claude Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
topic_facet |
Endothermy Marine birds Metabolic rate Non-shivering thermogenesis Shivering [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience t fledging, king penguin juveniles undergo a major energetic challenge to overcome the intense and prolonged energy demands for thermoregulation and locomotion imposed by life in cold seas. Among other responses, sea acclimatization triggers fuel selection in skeletal muscle metabolism towards lipid oxidation in vitro, which is reflected by a drastic increase in lipid-induced thermogenesis in vivo. However, the exact nature of skeletal muscle thermogenic mechanisms (shivering and/or non-shivering thermogenesis) remains undefined. The aim of the present study was to determine in vivo whether the capacity for non-shivering thermogenesis was enhanced by sea acclimatization. We measured body temperature, metabolic rate, heart rate and shivering activity in fully immersed king penguins (Aptenodytes patagonicus) exposed to water temperatures ranging from 12 to 29°C. Results from terrestrial pre-fledging juveniles were compared with those from sea-acclimatized immature penguins (hereafter ‘immatures’). The capacity for thermogenesis in water was as effective in juveniles as in immatures, while the capacity for non- shivering thermogenesis was not reinforced by sea acclimatization. This result suggests that king penguins mainly rely on skeletal muscle contraction (shivering or locomotor activity) to maintain endothermy at sea. Sea-acclimatized immature penguins also exhibited higher shivering efficiency and oxygen pulse (amount of oxygen consumed or energy expended per heartbeat) than pre-fledging juvenile birds. Such increase in shivering and cardiovascular efficiency may favor a more efficient activity–thermoregulatory heat substitution providing penguins with the aptitude to survive the tremendous energetic challenge imposed by marine life in cold circumpolar oceans. |
author2 |
Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Roussel, Damien Le Coadic, Marion Rouanet, Jean-Louis Duchamp, Claude |
author_facet |
Roussel, Damien Le Coadic, Marion Rouanet, Jean-Louis Duchamp, Claude |
author_sort |
Roussel, Damien |
title |
Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
title_short |
Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
title_full |
Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
title_fullStr |
Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
title_full_unstemmed |
Skeletal muscle metabolism in sea-acclimatized king penguins. I. Thermogenic mechanisms |
title_sort |
skeletal muscle metabolism in sea-acclimatized king penguins. i. thermogenic mechanisms |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://univ-lyon1.hal.science/hal-02998636 https://doi.org/10.1242/jeb.233668 |
genre |
King Penguins |
genre_facet |
King Penguins |
op_source |
ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://univ-lyon1.hal.science/hal-02998636 Journal of Experimental Biology, 2020, 223 (21), pp.jeb233668. ⟨10.1242/jeb.233668⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.233668 hal-02998636 https://univ-lyon1.hal.science/hal-02998636 doi:10.1242/jeb.233668 |
op_doi |
https://doi.org/10.1242/jeb.233668 |
container_title |
Journal of Experimental Biology |
_version_ |
1790602597148655616 |